.header{
    width: 100%;
    min-width: 1200px;
    height: 45px;
    line-height: 45px;
    font-size: 12px;
    color: #fff;
    background-color: #333;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    position: fixed;
    top: 0;
    z-index: 999;
}
.title{
    margin-left: 10px;
    font-size: 15px;
}